Question

Which of the following is false regarding elevated range test?

(a) To get AUT encounter uniform illumination, the amplitude variation should be less than 0.2dB

(b) The height criteria of AUT should be equal to or more than four times the dimension of antenna

(c) Range diffraction fences are used to reduce the antenna reflections.

(d) To get AUT encounter uniform illumination, the amplitude variation should be more than 0.2dB

This question was addressed to me in an interview for internship.

This is a very interesting question from Antenna Ranges topic in chapter Modern Antennas & Antenna Measurements of Antennas

Answer 1

Right option is (d) To get AUT encounter uniform illumination, the amplitude variation should be more than 0.2dB

For explanation: To get AUT encounter uniform illumination, the amplitude variation should not be more than 0.2dB. The height required to mount the AUT for the elevation range test is given by hr ≥ 4D, where D is the dimension of AUT. Range diffraction fences are used to reduce the antenna reflections.